This isn't particularly related to the current barnacle discussion, but I thought I'd throw this out there.
This is what I'm hearing in the UA sounds, in visual form. I now believe that the purrs are simply random high or low, and that they are regular, and don't contain any hidden code. It's a shame really, because FD has a way to hide more than 1 code (the ship drawing + more) in this sound. The only reason we are hearing "sets" of high and low purrs is due to a volume layer that is also applied to the purrs, which also explains why sometimes the leading purr is quieter than the rest, since it sometimes occurs where the "volume wave" tails-off. The trailing purr is also probably quiet sometimes, but we don't notice because it is often obscured by the honk/wail.
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Aye, this is how they are.
Yes they are regular, (except immediately after UA deployment while they ramp up) yes it's just you can't hear some of them as other sounds overlay.
Pretty sure it's not random, more pseudo-random.
Imagine a bunch of constructively interferring sine waves, anything above 0 manifests as a high purr, anything below is low purr.
It was a long time ago now but https://docs.google.com/spreadsheets/d/1hYabz1D5HUsmj45kl0gdr_7aCMoqKspwHGwcZDyvA4E/edit#gid=0
You can see the apparent wave effect in that spreadsheet, 1 in the ss indicates high purr, -1 low purr, the orange are the ones you can't hear so fill in 1 or -1 till you think it looks right. Essentially you can predict some of the purrs you can't hear.
The barnacle seems to manifest the same sort of pattern but much much slower, you have to speed the audio up x10 to hear it.
On "the purrs you can't hear" this is because they're stifled by the morse/honks. So I took the UA to IO, where the more portion is incredibly short (this was when the UA did the local bdy name, not the ship map as it does now) , to produce recordings which maximised the number of audible purrs in an attempt to obtain a "full" purr track.
Then after that kinda evolved the process to the point where I could obtain pretty much every purr consistently(from memory, don't have the spreadsheets with me) there are almost exactly 100 purrs you can record, I'd recover the UA with literally 1-2 seconds of lifespan left (this is when UAs were rare, you might as well let it pop now and just grab another)
I then transcribed 10 such recordings giving over an hour of purrs and I never saw a repeat.
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